<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>10-Vue 指令-v-on-参数传递</title>
    <style>
        .box {
          border: 3px solid #000000;
          border-radius: 10px;
          padding: 20px;
          margin: 20px;
          width: 200px;
        }
        h3 { margin: 10px 0 20px 0;}
        p { margin: 20px; }
      </style>
</head>
<body>
    <div id="app">
        <div class="box">
          <h3>小达自动售货机</h3>
          <button @click="buy(5)">可乐5元</button>
          <button @click="buy(10)">咖啡10元</button>
          <button @click="buy(8)">牛奶8元</button>
        </div>
        <p>银行卡余额：{{ money }}元</p>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.16/dist/vue.js"></script>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
                money:1000
            },
            methods: {
                buy(price) {
                    this.money -= price
                }
            }
        })
    </script>
</body>
</html>